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=== चतुर्युगाः ॥ Chaturyuga in terms of Human Varshas ===

=== चतुर्युगाः ॥ Chaturyuga in terms of Human Varshas ===

[[File:Kalachakra.png|thumb|653x653px|Yugas in terms of Human Varshas ]]Yuga Pramana involving the use of human varshas or years is well supported by astonomical texts.  According to the puranas and the astronomical texts one Chaturyuga consists of 43,20,000 solar years. Thousand Chaturyugas is termed a Mahayuga equalent to a Kalpa, which is the larger cycle of creation and destruction, and is seen as the day of Brahma. The four Yugas comprising the Chaturyuga are:  

[[File:Kalpa.png|thumb|654x654px|Chaturyugas in terms of Human Varshas]]

Yuga Pramana involving the use of human varshas or years is well supported by astonomical texts.  According to the puranas and the astronomical texts one Chaturyuga consists of 43,20,000 solar years. Thousand Chaturyugas is termed a Mahayuga equalent to a Kalpa, which is the larger cycle of creation and destruction, and is seen as the day of Brahma. The four Yugas comprising the Chaturyuga are:  

# कृतयुगम् ॥ Krtayuga

# कृतयुगम् ॥ Krtayuga

# त्रेतायुगम् ॥ Tretayuga

# त्रेतायुगम् ॥ Tretayuga

Indian astronomical siddhantas assumed that at the commencement of the Kalpa all the planets including Ketu were in conjunction (at the same celestial longitude) at the first point of Mesha and the ascending node (Rahu) of the Moon was 180 degrees away (i.e., at the first point of Tula).<ref name=":1">Balachandra Rao, S. (2014) Indian Astronomy. Concepts and Procedures. Benguluru : M.P. Birla Institute of Management</ref>

Indian astronomical siddhantas assumed that at the commencement of the Kalpa all the planets including Ketu were in conjunction (at the same celestial longitude) at the first point of Mesha and the ascending node (Rahu) of the Moon was 180 degrees away (i.e., at the first point of Tula).<ref name=":1">Balachandra Rao, S. (2014) Indian Astronomy. Concepts and Procedures. Benguluru : M.P. Birla Institute of Management</ref>

=== Brahma Ayu ===

=== Brahma Ayuh ===

The largest Indian time cycle is that of 100 years of the life of Brahma. Like [[Indra (इन्द्रः)|Indra]] is a position, Brahma is also a position of a creator.  <blockquote>एवंविधैरहोरात्रैः कालगत्योपलक्षितैः । अपक्षितमिवास्यापि परमायुर्वयःशतम् ॥ ३२ ॥</blockquote><blockquote>यदर्धमायुषस्तस्य परार्धमभिधीयते । पूर्वः परार्धोऽपक्रान्तो ह्यपरोऽद्य प्रवर्तते ॥ ३३ ॥</blockquote><blockquote>पूर्वस्यादौ परार्धस्य ब्राह्मो नाम महानभूत् । कल्पो यत्राभवद्‍ब्रह्मा शब्दब्रह्मेति यं विदुः ॥ ३४ ॥ (Bhag. Pura. 3.11.32-34)<ref name=":3" /></blockquote>Summary : In due course of Kala, with such types of days and nights as described above, even the Ayu (long span of life) of 100 years of Brahma comes to an end. Half of this Brahmayu is called Parardha (परार्धः). The first parardha of Brahma's life has passed, now the other half is running.   

The largest Indian time cycle is that of 100 years of the life of Brahma. Like [[Indra (इन्द्रः)|Indra]] is a position, Brahma is also a position of a creator.  <blockquote>एवंविधैरहोरात्रैः कालगत्योपलक्षितैः । अपक्षितमिवास्यापि परमायुर्वयःशतम् ॥ ३२ ॥</blockquote><blockquote>यदर्धमायुषस्तस्य परार्धमभिधीयते । पूर्वः परार्धोऽपक्रान्तो ह्यपरोऽद्य प्रवर्तते ॥ ३३ ॥</blockquote><blockquote>पूर्वस्यादौ परार्धस्य ब्राह्मो नाम महानभूत् । कल्पो यत्राभवद्‍ब्रह्मा शब्दब्रह्मेति यं विदुः ॥ ३४ ॥ (Bhag. Pura. 3.11.32-34)<ref name=":3" /></blockquote>Summary : In due course of Kala, with such types of days and nights as described above, even the Ayu (long span of life) of 100 years of Brahma comes to an end. Half of this Brahmayu is called Parardha (परार्धः). The first parardha of Brahma's life has passed, now the other half is running.   

== कालस्य ईश्वररूपम् Kala is Ishvara ==

== कालस्य ईश्वररूपम् Kala is Ishvara ==

रूपभेदास्पदं दिव्यं काल इत्यभिधीयते । भूतानां महदादीनां यतो भिन्नदृशां भयम् ॥ ३७ ॥

रूपभेदास्पदं दिव्यं काल इत्यभिधीयते । भूतानां महदादीनां यतो भिन्नदृशां भयम् ॥ ३७ ॥

गुणाभिमानिनो देवाः सर्गादिष्वस्य यद्‍भयात् । वर्तन्तेऽनुयुगं येषां वश एतच्चराचरम् ॥ ४४ ॥

गुणाभिमानिनो देवाः सर्गादिष्वस्य यद्‍भयात् । वर्तन्तेऽनुयुगं येषां वश एतच्चराचरम् ॥ ४४ ॥

सोऽनन्तोऽन्तकरः कालो अनादिरादिकृदव्ययः । जनं जनेन जनयन् मारयन् मृत्युनान्तकम् ॥ ४५ ॥

सोऽनन्तोऽन्तकरः कालो अनादिरादिकृदव्ययः । जनं जनेन जनयन् मारयन् मृत्युनान्तकम् ॥ ४५ ॥<ref>Bhagavata Purana (Skanda 3 [https://sa.wikisource.org/wiki/%E0%A4%B6%E0%A5%8D%E0%A4%B0%E0%A5%80%E0%A4%AE%E0%A4%A6%E0%A5%8D%E0%A4%AD%E0%A4%BE%E0%A4%97%E0%A4%B5%E0%A4%A4%E0%A4%AA%E0%A5%81%E0%A4%B0%E0%A4%BE%E0%A4%A3%E0%A4%AE%E0%A5%8D/%E0%A4%B8%E0%A5%8D%E0%A4%95%E0%A4%A8%E0%A5%8D%E0%A4%A7%E0%A4%83_%E0%A5%A9/%E0%A4%85%E0%A4%A7%E0%A5%8D%E0%A4%AF%E0%A4%BE%E0%A4%AF%E0%A4%83_%E0%A5%A8%E0%A5%AF Adhyaya 29])</ref>

== Madhu Vidya and Kala ==

== Madhu Vidya and Kala ==